一种小型热释电能量转换装置的特性分析

Characteristic analysis of small-scale pyroelectric energy conversion device

设计了一种小型热释电能量转换装置,基于热释电效应对该装置进行了理论分析,推导出了该装置的输出电流与电压的表达式。通过理论分析与实验的方法对简谐热激励下该装置的能量转换特性进行了研究,结果表明:当对装置进行调频处理时,热释电单元表面的温度将发生周期性的变化,并且在其正负极之间产生周期性变化的电压;调频频率、热源功率、装置散热情况及热释电陶瓷表面吸热率对该装置的输出电压会产生一定的影响;该装置产生的电能能量密度可达7.4mJ/cm3,可满足某些特殊场合的能量需求。

A focused pyroelecrtic energy conversion device was designed.Theoretical study was undertaken on the device and the formulas of voltage and current of the device was derived based on the pyroelectric effect.The characteristic of the device excited by aperiodic thermal excitation was researched through the simulation and experiments.Results showed that the temperature of the piezoelectric ceramics varies periodically and a periodic voltage is generated when the device is regulated periodically.The voltage of the device is influenced by the frequency of the device,the power of the heat source,the cooling condition of the device and the heat absorption efficiency of the piezoelectric ceramics.A power with energy density of 7.4mJ/cm3 is reached in the end,which is enough for a measurement and transmission cycle in an autonomous sensor node,providing a new idea in exploring the conversion process of thermal to electric energy.